Authorities say a flaming pile of cardboard at a recycling business that gave off an impressive amount of smoke today doesn't appear suspicious.

A large pile of cardboard caught fire about 11 this morning at the Ray Kraft and Son Salvage Yard, Phillipsburg police Chief James Faulborn said.

The cause of the fire remains under investigation, he said. Faulborn said an arson investigator isn't always called out to fires, but can be requested in cases where officers have questions. An investigator was called to the scene about 11:45 a.m.